#pragma once

#include <iostream>
#include <string>
#include <cerrno>
#include <cstring>
#include <cstdlib>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <functional>
#include "Log.hpp"
#include "InetAddr.hpp"


// echo server -> client -> server
enum
{
    SOCKET_ERROR = 1,
    BIND_ERROR,
    USAGE_ERROR
};

const static int defaultfd = -1;
using hander_message_t = std::function<void (int sockfd, const std::string message, const InetAddr who)>;

class UdpServer
{
public:
    UdpServer(uint16_t port, hander_message_t hander_message)
    : _sockfd(defaultfd), 
    _port(port),
    _isrunning(false), 
    _hander_message(hander_message)
    {
    }
    void InitServer()
    {
        // 1. 创建udp socket 套接字 --- 必须要做的
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(FATAL, "socket error, %s, %d\n", strerror(errno), errno);
            exit(SOCKET_ERROR);
        }
        LOG(INFO, "socket create success, sockfd: %d\n", _sockfd);
        struct sockaddr_in local; 
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_port); 

        local.sin_addr.s_addr = INADDR_ANY; 

        int n = bind(_sockfd, (struct sockaddr *)&local, sizeof(local));
        if (n < 0)
        {
            LOG(FATAL, "bind error, %s, %d\n", strerror(errno), errno);
            exit(BIND_ERROR);
        }
        LOG(INFO, "socket bind success\n");
    }
    void Start()
    {
        _isrunning = true;
        while (true)
        {
            char message[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            ssize_t n = recvfrom(_sockfd, message, sizeof(message) - 1, 0, (struct sockaddr *)&peer, &len);
            if (n > 0)
            {
                message[n] = 0;
                InetAddr addr(peer);
                LOG(DEBUG, "get message from [%s:%d]: %s\n", addr.Ip().c_str(), addr.Port(), message);
                _hander_message(_sockfd,message,addr);
            }
        }
        _isrunning = false;
    }
    ~UdpServer()
    {
    }

private:
    int _sockfd;
    // std::string _ip; // 暂时这样写，这个地方不是必须的.TODO
    uint16_t _port;  // 服务器所用的端口号
    bool _isrunning;
    hander_message_t _hander_message;
};